ARRANGEMENT AND METHOD FOR MEASURING AND CONTROLLING THE HEATING TEMPERATURE IN A SEMICONDUCTOR GAS SENSOR
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United States of America Patent
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Issued Date -
Oct 20, 2016
app pub date -
Apr 15, 2016
filing date -
Apr 17, 2015
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Abstract
An arrangement is provided for controlling the heating temperature in a semiconductor gas sensor comprising a control loop, consisting of a heating resistor as automatic control system of a measurement device measuring a physical quantity representing the temperature of the heating resistor, and an actuating unit controlling a power supply of the heating resistor, and a method which utilizes the arrangement. The actuating unit includes a pulsating voltage source, having a first pulse duration, during which the heating resistor is connected to an operating voltage, and a second pulse duration, during which the heating resistor is separated from the operating voltage, whose first and/or second pulse duration can be controlled as a correcting variable, A constant current source applies a measuring current to the heating resistor during the second pulse duration and a measurement device measures the measurement voltage drop across the heating resistor, whose output is designed as a controlled variable feedback in the control loop.
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